Mold-bottom for casting steel ingots



Patented Sept. 26, 1882.

\IVIT NESSES- r, Walhinion. D. C.

UNITED STATES ATENT OFFICE.

ELMORE A. BARNES, OF PITTSBURG, PENNSYLVANIA.

MOLD-BOTTOM FOR CASTING STEEL INGOTS.

SPECIFICATION forming part of Letters Patent 110,264,847, datedSeptember 26, 1882.

Application filed May 5, 1882. (Model) To all whom it may concern Be itknown that I, ELMORE A. BARNES, of Pittsburg, in the county of Alleghenyand State of Pennsylvania, have invented an Improvement inMold-Bottomsfor (lasting Steel Ingots; and I do hereby declare that thefollowing is a full and exact description thereof, reference being badto the accompanying drawings, making part of this specification- Figure1 being a top view of my improved mold-bottom Fig. 2, a bottom view ofthe same; Fig. 3, a side view of the removable block of the mold-bottomFig. 4, a vertical section through the mold-bottom and moldsidestogether.

Like letters designate corresponding parts in all of the figures.

In the use of the ordinary cast-iron bottoms for the molds employed incasting steel ingots serious troubles occur. The melted steel as it ispoured into the mold and strikes the bottom rapidly cuts the bottom awayat the center, and when thus a cavity is formed in the bottom and themelted steel fills the same at each casting a burr or excrescence isformed on the lower end of the ingot, which is a waste of so much metal;but thisis not the most serious result. This excrescence, when the ingotis heated forsubsequent rolling, cools more quickly than the body of theingot, so that it hardens sufficiently before passing between the rollsto indent the surfaces thereof, greatly to their injury, so that theyfrequently require redressing. The rapid destruction of the mold-.

bottoms from the cause specified also is an item of considerableexpense.

My invention is designed to obviate the foregoing objections to andimperfections of the cast-iron mold-bottoms.

It consists in a removable and replaceable block, A, of any suitablematerial that will sufficiently withstand the abrading action of themolten steel poured into themold, this block being secured in the middleof the bottom B of the mold and of sufficient size to receive the lowerend of the mold-body G, with a proper margin around the body.

Included in my complete invention, also, is

an improved means of securing the refractory block in the mold-bottom.

The mold-body 0 simply rests on the plane upper face of the block A forcasting ingots, and there is no peculiarity 'in its construction.

The refractory block A is preferably made of plumbago, or the mixture ofplumbago and clay which is employed in making crucibles for meltingcast-steel in. It may, however, be made of fire-brick materials or anyother that will serve the purpose of resisting heat and abrasion. Forsecuring this block in the bottom or base B so that it cannot be drawnany by the ingot clinging to it, (as sometimes would happen if notguarded against, since when the mold-bodyG is carelessly placed on thebottom some molten steel is apt to leak out underneath it and flow overthe edge of the block A, causing such adhesion of the ingot to the blockas to involve the destruction of the block in separating it from theingot,) I make the edges ofthe block somewhat inclined, likethe sides ofa pyramid, as shown in Fig. 3. This form prevents the adhesion of theoutflowing steel to the edges of the block; but especially this form issuited to my method of securing the block in the bottom or base B, whichis made in two parts, a b, the lower part, a, being a simple planeblock, and the upper part, b, being a rim-piece, with a space in themiddle just of the size and shape to hold the refractory block A, asshown in Fig. 4. The two parts a b are united after the insertion of therefractory block A by screws 0 .c, Fig. 2, or any equivalent means,which readily allows the separation of the parts and reuniting of thesame.

Any variation in the construction of the parts employed in my inventionwhich does not depart from the principle and purpose thereof may bemade, and the employment of the invention for any analogous purposewhich may be useful is contemplated herein.

Aseparate removable and replaceable block, even if not of refractorymaterials, may be used to advantage, though of course the refractoryblock is much the best.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a mold for casting ingots, a block, A, forming the bottom of themold, made of plumbago or equivalent refractory material or com- 2. Thebottom B, composed of the parts a b, constructed as described, incombination with [0 the refractory block A, substantially as and forposition, held in a holder, B, above which it the purpose hereinspecified.

5 projects, and its edges being inclined, in combination with themold-body O, which rests on the said block, substantially as and for thepurpose herein specified.

ELMORE A. BARNES.

Witnesses:

J. S. BROWN, E. J. BROWN.

